Tappet for stamping-mills.



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Patented Aug. 22, |899.

TAPPET FOR STAMPING MILLS. (Application med s'epc. e, 1895.1 (No Mudel.)

a". CMA. lum 'Imi UNITED STATESl PATENT OFFICE.

GEORGE WV. WAITT, OF SAN FRANCISCO, CALIFORNIA.

TPPET FOR STAM PING-MILLS.

SPECIFICATION forming part of Letters Patent No. 631,535, dated August22, 1899.

kApplication filed September 6, 1898. Serial No. 690,369. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. WAITT, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements in Tappetsfor Stamping-Mills, of which the following is a specification.

My invention relates to the fastening or clamping of tappets to thestemsof stampmills used in crushing gold and silver ores or other material;and it consists of an adjustable clamping device, as hereinafter eX-plained and as illustrated in the accompanying drawings, in WhichlFigure 1 shows a side elevationof the tappet, part being broken away.Fig. 2 is a section on line o; of Fig. l. Fig. Sis a similar sectionrepresenting the same system of clamping, but shows two gibs bearingupon the stem instead of one, as shown in Fig. 2. Fig. 4 is a detail ofthe clamping-band.

Tappets are now and have been heretofore secured to thelstems whichcarry the 'shoes of stamp-mills by means of Wedges, causing frictionalcontact to hold the tappet to the stem. These wedges are comparativelyeffective for the purpose, but the use of them is attended bydifficulties both in the application and removal of the tappet up ordown on the stem, according to the desired amount of drop of the stampfor the class of ore to be crushed and also change on account of thewearin g away of the shoes and dies. Another objection to thewedge-fastening is that the constant jar of the stamp in its droploosens the Wedges, necessitating the readjustment of the tappet to itsproper position on the stem. Another contingency is' drivingthe keys orwedges so hard` as to often split olf the side of the tappet and ruinit, resulting in a loss of time and expense in replacing another,causing not only the loss of tappet and time in replacing, but a loss inoutput of the mill. Anotherloss in time is in changing the tappets up ordown to compensate for the wear of the shoes and dies.

My invention is designed to avoid the above My invention is designed toavoid the above after explained.

In the drawings the tappet is shown more clearly in Fig. I. It consistsof a cylindrical sleeve A, which is fitted to receive the stem and hason one orboth ends a dan ge B, against which the cam bears in lifting.The interior Wall of the sleeve is chambered out longitudinally toreceive the gib or gibs, as shown at d, Figs. l and 2. These chambers orrecesses in the wallmay be single and on one side, as shown in Fig. 2,or duplicate and arranged on each side of a central line between theclamps, as shown in Fig. 3. gle or duplicate, is' placed a gib, fittingin the recess and having a stud e, of the width of the gib d,extendinginto a circumferential groove f, which receives theclamping-band g, the arrangement of the parts being such that the band gwhen drawn together or contracted about the sleeve bears upon the studand forces the gib against the stem. The band g is preferably made intwo parts, hinged together at Z and provided with outturned ends h,perforated to receive a bolt having a nut m, by which force is appliedto draw together the parts of the clamp and press the gib or gibs uponthe stem. The nut is held by a key la against turning. 'lhe gib is heldin the recess against longitudinal and lateral movement, and when thenut mis turned the gib is clamped by the band and pressed against thestem with frictional contact sufficient to hold it in place on the stemwhen acted on by the cam.

I prefer the arrangement of duplicate gibs shown in Fig. 3. These areplaced on each side 'of a central line drawn between the two parts ofthe band and near the movable ends.

`More contact-surface is thereby obtained and a wedging action isproduced by the band upon the gib projection.

I have shown two bands, these being pref erable; but they are exactduplicates and bear on studs of lthe same form on the gib.

I claim-V 1. A tappet having an interior chamber or recess in its wall,and a groove around it with an opening from the recess to the groove, agib having a stud or boss projecting into the groove, a band in thegroove and mechanism IOO for drawing upon the band and causing it topress upon the gib, the parts being constructed and combined,substantially as described.

2. The combination with the sleeve of the tappet having recessestherein, a two-part hinged band, a gib arranged in each recess, one neareach of the free ends of the band, said sleeve having openings from therecesses through which the band and gibs are designed to Contact, andmeans for drawing the lo parts of said band together, substantially asdescribed.

In testimony whereof I affix my signature in presence of two Witnesses.

GEORGE XV. WAITT. Witnesses:

HENRY E. COOPER, C. S. MIDDLETON.

